CBS Evening News

As Obama considers ISIS strategy, militants continue propaganda push

President Obama flies to Europe on Tuesday ahead of talks with NATO allies over the crisis in Ukraine. But they will also discuss the growing threat posed by ISIS, the Islamic extremists who have seized control of large sections of Iraq and Syria.

While Mr. Obama was touting an improving economy in Wisconsin, the terror group released the third issue of its English language online magazine, complete with pictures of the group executing Syrian soldiers and blowing up the homes of those who cooperated with police.

The slickly produced publication calls the beheading of U.S. journalist James Foley "a cooling balm for the believers' hearts" and claims "Foley's blood is on Obama's hands" because of airstrikes he ordered against ISIS fighters in Iraq -- 123 in all since the start of August.

"It is abhorrent that people who declare their allegiance elsewhere are able to return to the United Kingdom and pose a threat to our national security," said Cameron.

The White House has made it clear that it prefers to pull together a coalition of nations to take on ISIS in Syria instead of going it alone. But that approach is testing the patience of some lawmakers including one top Democrat, Sen. Dianne Feinstein, who said she thinks the president is being too cautious.